remotes.http: Support dvc push for http remotes (iterative#3343)

* remote.http: support _upload() via HTTP POST

- uploaded files are sent as chunked encoding POST data

Fixes iterative#3247

* remote.http: add support for HTTP basic and digest auth

- username, password, ask_password options work the same way as for
  ssh remotes
- basic_auth (bool) and digest_auth (bool) options added for http(s)
  remotes
- digest_auth takes precedence over basic_auth if both are enabled

* remote.http: auth_method() unit tests

* tests: Add functional tests for HTTP remotes

- HTTP remotes now tested locally using a SimpleHTTPServer instance that
  allows reading/writing to a temp directory

* tests: fix http tests on py3.5, 3.6

* remote.http: add custom auth method

* s/custom_header/custom_auth_header/

* Apply suggestions from code review

Co-Authored-By: Saugat Pachhai <suagatchhetri@outlook.com>
Co-Authored-By: Ruslan Kuprieiev <kupruser@gmail.com>

Co-authored-by: Saugat Pachhai <suagatchhetri@outlook.com>
Co-authored-by: Ruslan Kuprieiev <kupruser@gmail.com>

dvc/config.py

@@ -101,6 +101,13 @@ class RelPath(str):
     "shared": All(Lower, Choices("group")),
     Optional("slow_link_warning", default=True): Bool,
 }
+HTTP_COMMON = {
+    "auth": All(Lower, Choices("basic", "digest", "custom")),
+    "custom_auth_header": str,
+    "user": str,
+    "password": str,
+    "ask_password": Bool,
+}
 SCHEMA = {
     "core": {
         "remote": Lower,
@@ -169,8 +176,8 @@ class RelPath(str):
                     "gdrive_user_credentials_file": str,
                     **REMOTE_COMMON,
                 },
-                "http": REMOTE_COMMON,
-                "https": REMOTE_COMMON,
+                "http": {**HTTP_COMMON, **REMOTE_COMMON},
+                "https": {**HTTP_COMMON, **REMOTE_COMMON},
                 "remote": {str: object},  # Any of the above options are valid
             }
         )

dvc/remote/http.py

@@ -1,8 +1,10 @@
 import logging
+import os.path
 import threading
 
-from funcy import cached_property, wrap_prop
+from funcy import cached_property, memoize, wrap_prop, wrap_with
 
+import dvc.prompt as prompt
 from dvc.config import ConfigError
 from dvc.exceptions import DvcException, HTTPError
 from dvc.progress import Tqdm
@@ -12,6 +14,15 @@
 logger = logging.getLogger(__name__)
 
 
+@wrap_with(threading.Lock())
+@memoize
+def ask_password(host, user):
+    return prompt.password(
+        "Enter a password for "
+        "host '{host}' user '{user}'".format(host=host, user=user)
+    )
+
+
 class RemoteHTTP(RemoteBASE):
     scheme = Schemes.HTTP
     SESSION_RETRIES = 5
@@ -24,14 +35,26 @@ def __init__(self, repo, config):
         super().__init__(repo, config)
 
         url = config.get("url")
-        self.path_info = self.path_cls(url) if url else None
+        if url:
+            self.path_info = self.path_cls(url)
+            user = config.get("user", None)
+            if user:
+                self.path_info.user = user
+        else:
+            self.path_info = None
 
         if not self.no_traverse:
             raise ConfigError(
                 "HTTP doesn't support traversing the remote to list existing "
                 "files. Use: `dvc remote modify <name> no_traverse true`"
             )
 
+        self.auth = config.get("auth", None)
+        self.custom_auth_header = config.get("custom_auth_header", None)
+        self.password = config.get("password", None)
+        self.ask_password = config.get("ask_password", False)
+        self.headers = {}
+
     def _download(self, from_info, to_file, name=None, no_progress_bar=False):
         response = self._request("GET", from_info.url, stream=True)
         if response.status_code != 200:
@@ -48,6 +71,28 @@ def _download(self, from_info, to_file, name=None, no_progress_bar=False):
                     fd.write(chunk)
                     pbar.update(len(chunk))
 
+    def _upload(self, from_file, to_info, name=None, no_progress_bar=False):
+        with Tqdm(
+            total=None if no_progress_bar else os.path.getsize(from_file),
+            leave=False,
+            bytes=True,
+            desc=to_info.url if name is None else name,
+            disable=no_progress_bar,
+        ) as pbar:
+
+            def chunks():
+                with open(from_file, "rb") as fd:
+                    while True:
+                        chunk = fd.read(self.CHUNK_SIZE)
+                        if not chunk:
+                            break
+                        pbar.update(len(chunk))
+                        yield chunk
+
+            response = self._request("POST", to_info.url, data=chunks())
+            if response.status_code not in (200, 201):
+                raise HTTPError(response.status_code, response.reason)
+
     def exists(self, path_info):
         return bool(self._request("HEAD", path_info.url))
 
@@ -74,6 +119,24 @@ def get_file_checksum(self, path_info):
 
         return etag
 
+    def auth_method(self, path_info=None):
+        from requests.auth import HTTPBasicAuth, HTTPDigestAuth
+
+        if path_info is None:
+            path_info = self.path_info
+
+        if self.auth:
+            if self.ask_password and self.password is None:
+                host, user = path_info.host, path_info.user
+                self.password = ask_password(host, user)
+            if self.auth == "basic":
+                return HTTPBasicAuth(path_info.user, self.password)
+            if self.auth == "digest":
+                return HTTPDigestAuth(path_info.user, self.password)
+            if self.auth == "custom" and self.custom_auth_header:
+                self.headers.update({self.custom_auth_header: self.password})
+        return None
+
     @wrap_prop(threading.Lock())
     @cached_property
     def _session(self):
@@ -100,7 +163,13 @@ def _request(self, method, url, **kwargs):
         kwargs.setdefault("timeout", self.REQUEST_TIMEOUT)
 
         try:
-            res = self._session.request(method, url, **kwargs)
+            res = self._session.request(
+                method,
+                url,
+                auth=self.auth_method(),
+                headers=self.headers,
+                **kwargs,
+            )
 
             redirect_no_location = (
                 kwargs["allow_redirects"]

tests/conftest.py

@@ -4,6 +4,7 @@
 import pytest
 
 from dvc.remote.ssh.connection import SSHConnection
+from tests.utils.httpd import PushRequestHandler, StaticFileServer
 from .dir_helpers import *  # noqa
 
 
@@ -57,3 +58,9 @@ def _close_pools():
 
     yield
     close_pools()
+
+
+@pytest.fixture
+def http_server(tmp_dir):
+    with StaticFileServer(handler_class=PushRequestHandler) as httpd:
+        yield httpd

tests/func/test_data_cloud.py

@@ -30,6 +30,7 @@
     GCP,
     GDrive,
     HDFS,
+    HTTP,
     Local,
     S3,
     SSHMocked,
@@ -290,6 +291,20 @@ def _get_cloud_class(self):
         return RemoteHDFS
 
 
+@pytest.mark.usefixtures("http_server")
+class TestRemoteHTTP(HTTP, TestDataCloudBase):
+    @pytest.fixture(autouse=True)
+    def setup_method_fixture(self, request, http_server):
+        self.http_server = http_server
+        self.method_name = request.function.__name__
+
+    def get_url(self):
+        return super().get_url(self.http_server.server_port)
+
+    def _get_cloud_class(self):
+        return RemoteHTTP
+
+
 class TestDataCloudCLIBase(TestDvc):
     def main(self, args):
         ret = main(args)

tests/remotes.py

@@ -275,3 +275,11 @@ def get_url():
         return "hdfs://{}@127.0.0.1{}".format(
             getpass.getuser(), Local.get_storagepath()
         )
+
+
+class HTTP:
+    should_test = always_test
+
+    @staticmethod
+    def get_url(port):
+        return "http://127.0.0.1:{}".format(port)

tests/unit/remote/test_http.py

@@ -27,3 +27,74 @@ def test_download_fails_on_error_code(dvc):
 
         with pytest.raises(HTTPError):
             remote._download(URLInfo(url) / "missing.txt", "missing.txt")
+
+
+def test_public_auth_method(dvc):
+    config = {
+        "url": "http://example.com/",
+        "path_info": "file.html",
+        "user": "",
+        "password": "",
+    }
+
+    remote = RemoteHTTP(dvc, config)
+
+    assert remote.auth_method() is None
+
+
+def test_basic_auth_method(dvc):
+    from requests.auth import HTTPBasicAuth
+
+    user = "username"
+    password = "password"
+    auth = HTTPBasicAuth(user, password)
+    config = {
+        "url": "http://example.com/",
+        "path_info": "file.html",
+        "auth": "basic",
+        "user": user,
+        "password": password,
+    }
+
+    remote = RemoteHTTP(dvc, config)
+
+    assert remote.auth_method() == auth
+    assert isinstance(remote.auth_method(), HTTPBasicAuth)
+
+
+def test_digest_auth_method(dvc):
+    from requests.auth import HTTPDigestAuth
+
+    user = "username"
+    password = "password"
+    auth = HTTPDigestAuth(user, password)
+    config = {
+        "url": "http://example.com/",
+        "path_info": "file.html",
+        "auth": "digest",
+        "user": user,
+        "password": password,
+    }
+
+    remote = RemoteHTTP(dvc, config)
+
+    assert remote.auth_method() == auth
+    assert isinstance(remote.auth_method(), HTTPDigestAuth)
+
+
+def test_custom_auth_method(dvc):
+    header = "Custom-Header"
+    password = "password"
+    config = {
+        "url": "http://example.com/",
+        "path_info": "file.html",
+        "auth": "custom",
+        "custom_auth_header": header,
+        "password": password,
+    }
+
+    remote = RemoteHTTP(dvc, config)
+
+    assert remote.auth_method() is None
+    assert header in remote.headers
+    assert remote.headers[header] == password

tests/utils/httpd.py

@@ -1,7 +1,8 @@
 import hashlib
 import os
 import threading
-from http.server import HTTPServer
+from http import HTTPStatus
+from http.server import HTTPServer, SimpleHTTPRequestHandler
 from RangeHTTPServer import RangeRequestHandler
 
 
@@ -35,6 +36,35 @@ class ContentMD5Handler(TestRequestHandler):
     checksum_header = "Content-MD5"
 
 
+class PushRequestHandler(SimpleHTTPRequestHandler):
+    def _chunks(self):
+        while True:
+            data = self.rfile.readline(65537)
+            chunk_size = int(data[:-2], 16)
+            if chunk_size == 0:
+                return
+            data = self.rfile.read(chunk_size)
+            yield data
+            self.rfile.read(2)
+
+    def do_POST(self):
+        chunked = self.headers.get("Transfer-Encoding", "") == "chunked"
+        path = self.translate_path(self.path)
+        try:
+            os.makedirs(os.path.dirname(path), exist_ok=True)
+            with open(path, "wb") as fd:
+                if chunked:
+                    for chunk in self._chunks():
+                        fd.write(chunk)
+                else:
+                    size = int(self.headers.get("Content-Length", 0))
+                    fd.write(self.rfile.read(size))
+        except OSError as e:
+            self.send_error(HTTPStatus.INTERNAL_SERVER_ERROR, str(e))
+        self.send_response(HTTPStatus.OK)
+        self.end_headers()
+
+
 class StaticFileServer:
     _lock = threading.Lock()